Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee258fb3e54ce29a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 11:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d49da9df34280cb22e7b0258d8b1addd SHA-1: 41275bb09871e233a64293135483f255d30e8f74 SHA-256: ee258fb3e54ce29aa12724dc7e5cea0887e8b522352520d53b7d8ad5edcd0dc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs pointing to other PDF files, suggesting a distribution or SEO manipulation scheme. The presence of multiple unknown reputation URLs reinforces the suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bilmatbasim.com/userfiles/file/6633994893.pdf In PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/38763330845.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109061220036200.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/74372643564.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/38254116291.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/79098884420.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/zogud.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/56916913843.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/23659604384.pdfIn PDF document text
    • https://esvigo.com/upload/files/61170640447.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/xopagigenalod.pdfIn PDF document text
    • http://mobiliteit.nu/files/31776460194.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/93725949510.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b0aef5e9479eec3a77b7897bd866d384/xifozobibev.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1169369a31e7ed98214f0a571d95ef2f/wuwuda.pdfIn PDF document text
    • http://npas.ru/pic/file/jakadevu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/didoluzupovanaxaraxevobix.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/bikoroj.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/bunuzarapojusurisemolu.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/79312826966.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/62981247230.pdfIn PDF document text
    • http://hibertek.com/image/files/20210901_214653.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/leserazibasepamejikixonov.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/toxijovatikitavomofozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+root+explorer+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D9 16504 bytes
SHA-256: a0f1d4341d86b84f099b04085b3ba64d707a6a43c73d5d0e758e953ab5c649f0
font_02_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10540 bytes
SHA-256: aa2b2be112c595ee2205eb40d03a7395dbb7e030f401dfa03588fe05a0ab1099

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